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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75f31257f00acfd9687f65d36c04e9be9e5ca6eb8d5eabf8f71b750b9f375e8' 
  AND token = 'bNzGSsH3wT0J6VeP9VsIvmoS5zfA0unsI5gl7mJePmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}